Calcium Sulfate

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calcium sulfate

[′kal·se·əm ′səl‚fāt]
(inorganic chemistry)
CaSO4 A white crystalline salt, insoluble in water; used in Keene's cement, in pigments, as a paper filler, and as a drying agent.
Either of two hydrated forms of the salt: the dihydrate, CaSO4·2H2O, and the hemihydrate, CaSO4·½H2O.

Calcium Sulfate

 

CaSO4, a salt, existing in nature as the dihydrate CaSO4-2H2O (gypsum, selenite) and in an anhydrous state (anhydrite). Anhydrous calcium sulfate occurs in the form of colorless crystals with a density of 2.96 g/cm3 and a melting point of 1450°C. It combines very slowly with water, exhibiting a poor solubility of 0.2036 g per 100 g H2O at 20°C and 0.067 g at 100°C. The half-hydrate CaSO4-1/2 H2O is known; when mixed with water, it hardens rapidly, converting into CaSO«2H2O. Calcium sulfate is used in the manufacture of figures and casts, as a construction material, and in medicine.

calcium sulfate

Anhydrite or gypsum dihydrate which has been calcined to the point at which all the water of crystallization has been removed.
References in periodicals archive ?
Tagil, "Osteotomy of distal radius fracture malunion using a fast remodelling bone substitute consisting of calcium sulphate and calcium phosphate," Journal of Biomedical Materials Research--Part B Applied Biomaterials, vol.
Among the alloplastic materials available calcium sulphate has a long history of safe use.
Solubility of calcium sulphate has been extensively studied during decades since the pioneer contributions by van't Hoff and co-workers at the early twenty century (van't Hoff et al.
Keywords: phosphoric acid evaporators, calcium sulphate solubility, scale formation, modelling
The new production line for calcium sulphate pigment would raise the plant's total capacity from 110,000 tonnes a year to 150,000 tonnes a year.
Line of fillers and functional pigments includes clays (water-ground kaolins and bentonites), mica (muscovite and biotite), barytes (natural white and off-white grades), calcium sulphate, calcium carbonate, and the Polytal series of platy talcs designed specifically for polyolefins.
This is not the case where sulphuric acid was formerly neutralised with lime as IMP Ecomag does not form insoluble calcium sulphate, says Industrial Metal Processes.
The Finnish chemical industry group Kemira Oyj said today (19 December) that its subsidiary Kemira Chemicals Oy would increase its calcium sulphate pigment production by investing EUR5m into expansion of its pigment plant in Siilinjarvi, Finland.
This is a chemical process whereby the sulphur oxides produced in carbon combustion processes are captured and washed as they come out of the boilers, they are then coated with limestone which reacts with the sulphur dioxide (SO2) producing a mixture of sulphite and calcium sulphate.
Cavity floor system with calcium sulphate screed approx.
Thermoluminescent phosphor material examples are calcium fluoride, lithium fluoride, lithium bromide, and calcium sulphate.
4 280,000 m 2 calcium sulphate screed screed on insulating layer f4 d 70 mm, - approx.